Electric regulator



Nov. 29, 1927.

1,650,604 F. A. BYLES ELECTRIC REGULATOR Filed Oct 17. 1934 Inventorw Frank A. Byles His Attorney turn '1.

= later which may he FRANK A. BYLES, F SCHENECTADY, KEV? YORK, TB GENERAL ELECTRIC COMPA'LTY, A COHF'QRATIQIQT OF NEW 1303K.

ELEOTRTC REGULATOI.

Application filed October 17, 1924. Serial No.

lily invention relates to electric regulators comprising a vibratory device which in response to the condition being to cotrol suitable regulating a.nti-li'--;i1io means; and par- K to electric regr sting in which the desired 1 is obtained by means a vibrator re ator which controls the excitation ot an enciter, which, in connected so that it controls the condone to be regulated.

in object of in iuve ition, to provide improved means for uv undesirable ercoinpound d o a eii'ccted h hu'oting; ineans thereof.

idy invention will he hotter understood from the following description, taken in connection with the accoinpz lying diagrammatic drawing, which shows voltage regu lating system embodying in ii'ivention and its scope will he pointed out in the appended claims.

Referring to the drawing, 1 represents a generator which supplies current to an elec tric circuit 2. The generator 1 is excited from an exciter bus 8 which is energized by an ei-tcitcr 4;. For controlling the excitation of the generator 1 so as to maintain the voltage thereof constant, a voltage regulator of the type disclosed and claimed 1n Thompson Patent No. 1,865,566 granted {Te-.1111, 199.1 and assigned to the same as signee as this application, is shown. The regulator comprises a counter electroinotive force machine 5 connected in a field circuit of the exciter 4i, and a vibratory device 19 which controls the excitation of. the counter electroinotive force machine in response to the voltage of the generator. As shown, the counter electroniotive force machine 5 is a motor having its armature winding 6 connected in series with the shunt held 7 of the exciter and its hold winding 8 connected across the esicitor hue u \Vltll tllQ resistor S) in series therewith.

in order to prevent excessive variations in the speed of the motor 5 a suitable brake 10 is provided therefor. its shown in the ill drawing the brake is 01" the magnetic drag type and comprises a core 11 on which the windings 12 and 1e are wound and between the poles 0t which rotates a disk 14 or conducting material connected to rotate with the armature ot the motor 5. The winding 12 is connected in parallel with the armature winding 6 of the motor 5 and the winding; 13 is connected in series therewith so that hr effect of the brake increases as the cur hrough the motor armature and the counter electroniotive force of the motor increase.

The vibratory device 19 is arranged to vary the exci tion of the motor 5 by opening and closing the contacts 15 which are connected so as to complete a short circuit around the field winding; 8 when they are closed. The vibratory device 19 comprises a voltage winding 16, an anti-hunting winding 17, and a compensating winding 18. Ti lie voltage winding 16 is connector across the circuit 2 by a transformer 20 so that it is responsive to the voltage of the circuit 2 which, in the system shown, is the charactcn istic of the output of the generator it is desired to maintain constant. If some other characteristic were to he regulated, this ing 16 is arranged in any suitable manner so that it opens the contacts 15 when the voltage of the eXciter 2 exceeds a predetermined value and closes the contacts when the voltage decreases below a predetermined value.

The anti-hunting winding 17 is connected and arranged so that its energization is varied by the opening and closing of the contacts 15 to cause a rapid opening and closing of the contacts. As shown, the winding 17 is connected across the resistor 9 so that the current through the winding 17 varies inversely with the current through the field winding 8. For example, when the contacts 15 are closed, the current through the winding 17 increases and the current thror ;h the field winding 8 decreases, whereas when the contacts 15 are opened the current through the winding 17 decreases and the current through the winding 8 increases. The wii ing 17 is arranged in any suitable manner so that when the contac .5 15 are closed and the excitation of the winding 17 is increased, the increase in the excitation ot the winding 1.7 effects the opening ot the contacts 15, and when the contacts 15 are opened and the excitation of the winding 17 is decreased the decrease in the excitation of the winding 17 effects the closing oi the'contacts 15.

It is well known in the art that as the load connected to the circuit 2 increases, the

excitation of the generator has to be increased in order to maintain the voltage constant. Therefore, the regulator has to short circuit the field winding 8 more of the time in order to obtain this increased excitation of the generator. Consequently, the

,energization of the winding 17 is increased so that the average pull of the winding is increased. Since each of the windings 16 {and 17 is arranged so that an increase in the excitation thereof tends to open the contacts 15, it will be evident that the antihunting winding has an undercompounding effect. Therefore, as the load on the circuit increases, the voltage which the regulator maintains constant decreases.

In order to overcome this under-compounding efiect of the anti-hunting winding, I provide the compensating winding 18, which is connected so that it is energized in accordance with a characteristic of the output of the exciter. As shown, the compensating winding 18 is energized in accordance with the voltage of the eXciter 1-. The compen sating winding 18 is arranged so that it opposes the antihunting winding 17. Since the regulator operates to increase the ex citer voltage when the load increases, the energizations of both of the windings 17 and 18 are increased by an increase in the load.

Therefore, it is evident that by properly adjusting the winding 18, it can be made to compensate to any desired degree the undercompounding tendency of the anti-hunting winding 17.

WVhile I have, in accordance with the pat-- ent statutes, shown and described my invention as applied to a particular system and as embodying various devices diagrammatically indicated, changes and modifications will be obvious to those skilled in the art and I, therefore, aim in the appended claims to cover all such changes and modifications as fall within the true spirit and scope of my invention.

lVhat I claim as new and desire to secure by Letters Patent of the United States, is,-

1. In a regulating system for controlling a predetermined electrical characteristic of the output of a generator wherein the desired regulation is effected by varying the excitation of a counter electromotive force machine in the field circuit of an cxciter for the generator, a vibratory device for controlling the excitation of said counter elec tromotivc force machine having a winding responsive to the electrical characteristic of.

ing responsive to an electrical characteristic of the output of the exciter supplled to said generator for modifying the operation of said vibratory device to compcntatc the compounding tendency ot said anti-hunting winding.

2. In a regulating system for controlling a predetermined electrical characteristic of the output of a generator wherein the desired regulation is eilected by varying the currentfiowing through a field circuit of a counter GlGCtIOlIlO'tlVQ force machine in the field circuit of an exciter for the generator, a vibratory device for controlling the current in said. field circuit of the counter electromotive force machine comprising a winding responsive to the electrical characteristic of the output of the generator being regulated, an anti-hunting winding connccted and arranged so that its encrgization varies with the excitation of said field current of said counter electromotive force machine and a compensating winding responsive to an electrical characteristic of the output of the excitation supplied to said generator for compensating the compounding tendency of said anti-hunting winding, said anti-hunting and compensating wind ings being arranged in opposition to each other.

3. In. a regulating system for controlling the voltage of a generator wherein the desired regulation effected by varying the currents flowing through a field circuit of a counter electromotive force machine in the field circuit of an exciter for the generator, at vibratory device for controlling the current in said field circuit ot the counter clcctromotive force machine comprising a winding responsive to the voltage of said generator, an anti-hunting winding connected to the field circuit of said counter electromotive force machine, and a compensating winding responsive to the voltage of said exciter for compensating the con'lpounding tendency ot said anti-hunting winding.

In witness whereof, I have hereunto set my hand this 16th day of October, 1924:.

FRANK A. BYLES.

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